Database Install/Upgrade/Opatch (MOSC)

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ORA-12541: TNS:no listener error code is related to problems on the client side

in Database Install/Upgrade/Opatch (MOSC) 4 commentsAnswered

Hello All,

We have a Windows 2012 R2 server, sitting behind a subnet and firewall. It has Oracle 11g Client software installed on the G: drive (does Oracle require install on C: drive?). When we try to connect to the Oracle RAC database on a Linux server, we get the ORA-12541/TNS-12541 no listener errors.

1) we can do a nslookup successfully between the two servers

2) we can do a tnsping successfully between the 2 servers

3) cyber team has validated that the firewall between the two servers is open

4) the sqlnet.ora file has correct parameters

5) the tnsnames.ora has been copied from a 'working' server, so it should work in theory

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